17, I use an inexpensive twin tank 5hp with a hopper for texture spray, if that is what you have planned... Mine is too small, also, but I've used 'em for years to do repairs and room at a time type stuff.
And I've done three and four rooms, a medium sized house...
Man does that hopper get heavy!
What is best?
A spray rig that has it's own mixer is best.
If not that, probably a Kodiak and 9cfm compressor w gas motor.. abt $5k
The peristaltic tube mud pumps just don't have a good enough production rate, to be worth it, and you still gotta handmix the mud.
9cf per min free air is abt the minimum free air you need for real production kinda work. The tube-pump machines don't have that either.
We used a Porter Cable pancake compressor, don't recall the HP, but you can buy them at Lowe's Cheap, and their hopper, too. Worked fantastic. Get a thermal-reducing coupler/hose, that will help with the hose heating up.
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